The Dark Knight Rises

It has been eight years since Batman vanished into the night, turning, in that instant, from hero to fugitive. Assuming the blame for the death of D.A. Harvey Dent, the Dark Knight sacrificed everything for what he and Commissioner Gordon both hoped was the greater good. For a time the lie worked, as criminal activity in Gotham City was crushed under the weight of the anti-crime Dent Act.

But everything will change with the arrival of a cunning cat burglar with a mysterious agenda. Far more dangerous, however, is the emergence of Bane, a masked terrorist whose ruthless plans for Gotham drive Bruce out of his self-imposed exile. But even if he dons the cape and cowl again, Batman may be no match for Bane.

the official version from warnerbros.com on July 10, 2012

Eight years after the events of The Dark Knight, Batman faces challenges from the brutal Bane and the stealthy Catwoman.

a paraphrased formulation from empireonline.com on November 22, 2011

Christian Bale returns as Batman. No additional plot details have been announced.